Revert r241818 that updated dialog to 20120706. This turns out to horribly break mixed form dialogs in conjunction with the FreeBSD termcap, making the bsdinstall partition editor Add dialog, among other things, completely nonfunctional. This restores dialog 20110707.

Update dialog to version 20100428. This changes the license under which dialog is distributed from GPLv2 to LGPLv2 and introduces a number of new features and a new and better libdialog API. The existing libdialog will be kept temporarily as libodialog for compatibility purposes until sade, sysinstall and tzsetup have been either updated or replaced.